Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2008-03-11
2008-03-11
Korzuch, William (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S118000
Reexamination Certificate
active
10609615
ABSTRACT:
An optical-recording-medium playback apparatus includes a first optical member which focuses light emitted from a light-emitting unit on an optical recording medium, a second optical member which focuses light reflected by the optical recording medium, a light-receiving unit which receives the light focused by the second optical member, and a pinhole which is disposed between the second optical member and the light-receiving unit. The focal point of the light focused by the first optical member and that of the light focused by the second optical member correspond to each other. Accordingly, when the pinhole only transmits light which passes through positions around the focal point of the second optical member, stray light from positions around the focal point of the first optical member (in particular, light reflected by recording layers other than the one from which information is read out) can be removed.
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Haley Joseph
Korzuch William
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